Its sounds like a thump from the back diff when putting car into gear or changing gear have replaced back diff all the bushes started changing engine mountings if its not the engine mountings what could this noise be
If you have a 4x4 most likely your rear axel bushing is cracked, no big deal, just swing by your nearest Toyota dealer and order it. it goes for about $120. Easy to replace, use wd4 or nutsoff to spray inside the car body a few hours before trying to replace it. The accumulated dirt and road salt make it very hard to take the two long bolts out without a ¨fight¨. Please make sure you use a support jack to hold the rear axel in place when you get the bushing out.
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the "backlash" felt by reversing the drive shaft direction is normally the clearance in the spider gears in the diff so to get rid off that ( not necessary unless it is excessive) is to pull the diff center out and fit new thrust washers behind the spider gears
next check the diff mount bushes as the diff reaction will move the bolts in the mounts and make the noise
planetary gears are normally straight cut spur gears and will be noisy in operation. There may be wear in the shafts that they run on and there may be needle bearing wear. Normally you will not hear the noise as you are inside the car. The whine is an indication of a mechanical problem and will be there in all gears . There is a possibility that the noise is from the diff but if you listen carefully when driving if it is there under load but changes on over run(coasting) then it will be the diff of is on and off when you hold a steady speed it will be the diff. Have an accredited transmission specialist shop give you another opinion but if it is the transmission I would not race out right away to have it replaced.
Raise the vehicle and properly support it. Remove the wheel and drum. Remove the rear diff cover, have a drain pan underneath to catch the gear oil. Place the trans in nuetral, chalk the front wheels to keep vehicle from moving if you forget to put it back into park befor you lower the vehicle. Rotat the differential until you see the bolt that holds the diff pin in place. Remove the bolt, 5/16 or 8 mm I believe. You can then remove the diff pin, do not rotate the diff with the diff pin removed! Push the axle in, you can then remove the C-clip that holds the axle to the side gear, it will usuall drop or just fall out. Pull the axle out of the rear diff and replace the seal.
Put everything back together. Use black or grey RTV to reseal the diff cover making sure o clean up both surfaces as best you can. Put trans in park. Lower the vehicle. Remove the fill plug from the side of the differential and fill with gear lube until lube comes out the hole. Reinstall the plug and your good to go.
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When was the last time you had your rear differential looked at or serviced? Basically when its happening something in your drive train is out of whack, so to fix it we need to look at the sequence of where the power goes, but if it sounds like its coming from the back,we'll start at the drive shaft itself, when it spins, it gives power to the rear differential, which is most likely where the noise is coming from. Driving should be limited while this problem is occurring because if any of the gears in the rear diff have become shaved or broken, the problem could get much worse while spinning with the pieces of gear are spinning around inside the still working gears. The first thing you should do is re-lubricate the gears in the rear, if this doesn't fix it, a trip to the shop is in order.
This may not be your solution but,,,
Has the diff oils been changed lately?
If the wrong diff oil has been put into it,it will make the limited slip clutch plates,shudder and /or jump.It will mostly happen on small tight turns and will make the back of the car shake and thumping sounds.What it is,is the clutch plates in the ltd slip diff,shuddering instead of slowly slipping.If this is your problem,there is 2 solutions.You can buy an additive for the ltd slip diff,or get the entire oil changed.I would do the latter
Hope this helps
I have the same vehicle, with the same issue. I had put the car on a rack and lifted it to pin point the cause of the clunk when shifting from park to reverse or reverse to drive. I found that the front diff mounts were grenaded, meaning they needed to be replace bad. with these mounts being bad it was causing the front diff housing to slam the frame up and down when shifting from park or reverse to drive. this is pretty expensive to fix, your talking $160 in parts and $540 in labor. I also had the service 4WD warning display on my dash cluster, i had the code read. It came up as a bad solenoid in the rear diff. this is about $200 parts and labor to fix. Also, dont know how many miles are on your jeep but if you've ever sub-merged your axles under water or if your over 60,000 miles you need to replace your gear oil in the front diff, rear diff and transfer case. This is a little costly to have a mechanic do as well because you're supposed to use synthetic gear oil. For a shop to do it you're looking at $360.
I've never seen a differential fail in that situation but having been in the business a long time I've learned that all things are possible...Exactly where is the oil leaking on the diff? I'd suggest you get back onto level ground and remove the rear cover on the diff and take a look at the gears. Possible that the spider gears in the center section have broken.
It's the wheel bearing. Guaranteed. Just replaced mine. Go to Audiworld tech articles for step by step instructions on how to test the wheel bearings. They must have been put in wrong last time or they just went out again.